Malicious PDF — malware analysis report

Static analysis result for SHA-256 535e815d6261c4fc…

MALICIOUS

PDF

106.6 KB Created: 2021-03-30 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0824c3e6c7d7977d5f5397e66bb2da60 SHA-1: 24781d32b3d70401920580bdf29d787169ab1d87 SHA-256: 535e815d6261c4fc6f8308e1589faedfe52e5e5949de5a169fbdb996b9e4d952
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated and appears to contain junk data, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=army+combatives+level+1+powerpoint PDF link annotation
    • http://xazirinid.iblogger.org/abrsm_grade_6_theory_past_papers.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/beko_hbs_7600w.pdfIn PDF document text
    • http://nelitip.22web.org/lefuzilozigefijutex.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/lizufapetavinomuxor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0620f7-25fa-45d3-b564-12370a413753/tulunefapuzipukulom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bfe043-aff0-4f29-99ba-4913abd0910d/bazuwofekaji.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/nixon_51-30_chrono_watch_price.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/10440489496.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/a_song_of_ice_and_fire_tabletop_miniatures_game_rulebook.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/ectomorph_workout_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66593bd7-0958-48b7-b712-4a54cc247fff/what_are_the_5_stages_of_group_dynamics.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_4c733a021579427a9746f234d03b853d.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_48ce9375a2754a249053ce0f1d013f56.pdf?index=trueIn PDF document text
    • http://xekokopadupino.rf.gd/aqeedah_wasitiyyah_uthaymeen.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/curso_de_bienes_raices_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dcc9e1-6bf1-483a-97f4-8e065443b2ea/what_are_the_last_words_in_romeo_and_juliet.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_5723aafcb4304a578b0dbdd4aa9bb8aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/weather_report_chandausi_uttar_pradesh.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_1d47db2e38b04ac2ae80a939cb785e00.pdf?index=trueIn PDF document text
    • http://lopesexam.epizy.com/how_to_take_apart_margaritaville_blender.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_74149257e89e4d45b22d5a7b45bcadff.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_b580e6c5f278473c91ba13678175d21d.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_ac172f5b4d3c4b0f80f82e14839af3fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/37368702779.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001631f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631F 5516 bytes
SHA-256: bf48fb9516995a841076dc54de8b92034bc39162667ba3d103691f3f9a79e7c7
font_01_sfnt_off000175e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E8 11528 bytes
SHA-256: 34c0731e7fc1dd9c786a134e3f538e298a74de1b8cf906602c93852ef0bd16cf